ninja57

Ok guys I won't be able to do ant tests at the moment, but I should have the volume of the air tank soon. I plan to fill it with water and measure that. Also in response to DrRocket, we use a small piece of pvc with the same thickness and diameter to cut the potato down so its circumference is perfectly round so it's sides are streamlined, however the front is mostly flattened. Also, Schrodinger's hat, a ball-park estimate was all I really wanted and thanks for the calculations. I didn't know how to do it without it being linear graph, and since the actual distances weren't linear, it was off of Schrodinger's hat's predictions by at least 45-50ft. When I get the results from the air tank, I'll immediately post them (ft3 and cm3 forms).

Ok. Me and my friend have a pneumatic potato cannon and want a fair prediction of what the distance will be once we increase the pressure. Here are the results from previous firing: 29psi - 313ft.(199.9479614kPa - 95.4024 meters) 60psi - 467ft.(413.6854374kPa - 142.3416 meters) 80psi - 582ft.(551.5805832kPa - 177.3936 meters) 90psi - 630ft.(620.5281561kPa - 192.024 meters) Assuming that all tests were fired at a 43 degree angle and the air temperature was 70 fahrenheit(21.1 celsius) and that all potatos fired were 2.74oz(77.678grams) and 1.5in(38.1mm) in diameter. The barrel is 1.5in(38.1mm) in diameter and 10.2916ft(3.13687968meters) in length. The potatoes fit tightly in the barrel so that's important too. Leave out the aerodynamics as that is too hard for me to determine. Can anyone figure out what the distance will be at 100psi(689.475729kPa) and 115psi(792.897088716kPa)? I have been working on this for weeks with no luck and I would be very grateful if someone can get the answer.